There are two interwoven themes in the novel. The first is the cost of justice. Destroying the race that attempted to destroy humanity (and, it is later revealed, other races) appears to be a simple matter of retaliation. The Killers, when they are discovered, have formidable
philosophical defenses in addition to their vast technological resources. They have created hundreds of sapient races, interlocked in a culture of breathtaking complexity and beauty. The execution of justice falls to children of the destroyed planets. Those from Earth base their on-ship culture on
Peter Pan, calling themselves Wendys and Lost Boys. It is revealed once the Leviathan system is destroyed that the Killers were, in fact, still active within the system, continuing to manufacture fleets of self-replicating machines to destroy alien races. However, while the Killers were destroyed and justice served, trillions of what were likely innocents had to die to accomplish this. Bear leaves the human crew torn between relief that their work is complete and their guilt that they were little better than those they had come to destroy. ==Reviews==